# test 02 (Si)
## d-spacing (A)    angle_to_x (deg)
# 2  1  1    2.7053      1000.0
2.6985  0.13
# 2  3  1    1.7710        46.1
1.7684  28.89
# 2  5  1    1.2098       117.4
1.2103  41.57

# angle((2,1,1), (2,3,1))
# 29.205932247399424
# angle((2,1,1), (2,5,1))
# 41.81031489577861
# angle((2,5,1), (2,3,1))
# 12.604382648379175

# zone axis : [-1, 0, 2]